Check the assembly for overall warping. Examine the operating
knob for satisfactory operation. If any part of the copyboard
assembly is defective, report the condition to the proper
(1) Install the copyboard (1, fig. 4-27) on the axle
and tube assembly (4), being sure that it sits flush.
(2) Turn the copyboard counterclockwise so that
the locking devices (2) are inserted in the slots of the copyboard
flange. Tighten the hand knobs.
4-53. Copyboard locking Device
a. Description. The copyboard locking device (2, fig. 4-
on the axle and tube assembly (4).
of a positioning stud with a hand knob threaded on the exterior
end and a lockwasher and nut on the inner end holding it to the
Unscrew knob (1, fig.4-28) from positioning stud
Figure 4-28. Copyboard locking device, exploded
(3) From the inside of axle and tube assembly (5),
remove nut (4) and lockwasher (3) from stud (2). Tap out the
c. Cleaning and Inspection. Clean the parts with cleaning
solvent and dry with a clean, soft cloth. Inspect the hand knob
and positioning stud for worn threads, bends, and breaks.
Replace defective parts if necessary.
assembly (5). From the inside of axle and tube assembly (5),
install nut (4) and lockwasher (3) on stud (2).
Screw knob (1) on stud (2).